diff --git a/0003-backport-Fix-pattern-documentation-for-case-insensitive-ranges.patch b/0003-backport-Fix-pattern-documentation-for-case-insensitive-ranges.patch
new file mode 100644
index 0000000000000000000000000000000000000000..00edfd898c839ecb1238844503019c943b80484c
--- /dev/null
+++ b/0003-backport-Fix-pattern-documentation-for-case-insensitive-ranges.patch
@@ -0,0 +1,33 @@
+From 38389534dabcf98bcbda70ef516c2b00f9ec67e9 Mon Sep 17 00:00:00 2001
+From: Martin Joerg <martin.joerg@gmail.com>
+Date: Mon, 27 Mar 2023 10:20:18 +0200
+Subject: [PATCH] Fix pattern documentation for case-insensitive ranges
+
+---
+ doc/flex.texi | 6 +++---
+ 1 file changed, 3 insertions(+), 3 deletions(-)
+
+diff --git a/doc/flex.texi b/doc/flex.texi
+index bccab1e..acdd04c 100644
+--- a/doc/flex.texi
++++ b/doc/flex.texi
+@@ -952,13 +952,13 @@ character range such as @samp{[a-z]} or @samp{[S-W]} where it is obvious that yo
+ want case-folding to occur. Here are some examples with the @samp{-i} flag
+ enabled:
+ 
+-@multitable {@samp{[a-zA-Z]}} {ambiguous} {@samp{[A-Z\[\\\]_`a-t]}} {@samp{[@@A-Z\[\\\]_`abc]}}
++@multitable {@samp{[a-zA-Z]}} {ambiguous} {@samp{[A-Z\[\\\]^_`a-t]}} {@samp{[@@A-Z\[\\\]^_`abc]}}
+ @item Range @tab Result @tab Literal Range @tab Alternate Range
+ @item @samp{[a-t]} @tab ok @tab @samp{[a-tA-T]} @tab
+ @item @samp{[A-T]} @tab ok @tab @samp{[a-tA-T]} @tab
+-@item @samp{[A-t]} @tab ambiguous @tab @samp{[A-Z\[\\\]_`a-t]} @tab @samp{[a-tA-T]}
++@item @samp{[A-t]} @tab ambiguous @tab @samp{[A-Z\[\\\]^_`a-t]} @tab @samp{[a-tA-T]}
+ @item @samp{[_-@{]} @tab ambiguous @tab @samp{[_`a-z@{]} @tab @samp{[_`a-zA-Z@{]}
+-@item @samp{[@@-C]} @tab ambiguous @tab @samp{[@@ABC]} @tab @samp{[@@A-Z\[\\\]_`abc]}
++@item @samp{[@@-C]} @tab ambiguous @tab @samp{[@@ABC]} @tab @samp{[@@A-Z\[\\\]^_`abc]}
+ @end multitable
+ 
+ @cindex end of line, in negated character classes
+-- 
+2.9.3.windows.1
+
diff --git a/flex.spec b/flex.spec
index 82c1c075a4de741e872d8a1f9c5d296ed7896d38..a90d708946945bb49ce603f9d891b4a512ad1ddb 100644
--- a/flex.spec
+++ b/flex.spec
@@ -1,6 +1,6 @@
 Name: flex
 Version: 2.6.4
-Release: 5
+Release: 6
 Summary: A fast lexical analyzer generator
 License: BSD
 URL: https://github.com/westes/flex
@@ -17,6 +17,7 @@ Patch0007: scanner-temporarily-protect-against-ccl-overflow-ove.patch
 Patch0008: scanner-prevent-overflow-in-add_action.patch
 Patch0009: 0001-scanner-fix-default-of-yy_top_state.patch
 Patch0010: 0002-scanner-fix-default-of-yy_top_state.patch
+Patch0011: 0003-backport-Fix-pattern-documentation-for-case-insensitive-ranges.patch
 
 BuildRequires: gcc gcc-c++ gettext help2man m4 bison texinfo automake autoconf
 Requires: m4
@@ -105,6 +106,9 @@ fi
 %{_mandir}/man1/*
 
 %changelog
+* Tue Jul 30 2024 guojunding <guojunding@kylinos.cn> - 2.6.4-6
+- Fix pattern documentation for case-insensitive ranges
+
 * Tue Jul 12 2022 panxiaohe <panxh.life@foxmail.com> - 2.6.4-5
 - enable check test suite
 - delete duplicate package files: NEWS,README.md